Capital Research reports 3.8% stake in Materion

Materion Corp. ownership disclosure: Capital Research Global Investors amended a Schedule 13G to report beneficial ownership of 789,873 shares of Materion Corp. common stock, representing 3.8% of 20,801,338 shares outstanding.

Rhea-AI Filing Summary

Materion Corp. ownership disclosure: Capital Research Global Investors amended a Schedule 13G to report beneficial ownership of 789,873 shares of Materion Corp. common stock, representing 3.8% of 20,801,338 shares outstanding. The filing lists sole voting and dispositive power over those shares.

Key Figures

Shares beneficially owned: 789,873 shares Percent of class: 3.8% Shares outstanding: 20,801,338 shares +2 more

5 metrics

Shares beneficially owned 789,873 shares Amount beneficially owned reported on Schedule 13G/A

Percent of class 3.8% Percent of common stock outstanding as reported

Shares outstanding 20,801,338 shares Shares believed to be outstanding (basis for percent)

Sole voting power 789,873 shares Sole power to vote or to direct the vote

Signature date 05/11/2026 Filing signed by Jae Won Chung

Key Terms

beneficially owned, Schedule 13G/A, sole dispositive power

3 terms

beneficially owned regulatory

"CRGI is deemed to be the beneficial owner of 789,873 shares or 3.8%"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Schedule 13G/A regulatory

"Amendment No. 4 ) Materion Corp. Common Stock ... SCHEDULE 13G/A context"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 789,873"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Capital Research Global Investors report in MTRN?

Capital Research Global Investors reports beneficial ownership of 789,873 shares, equal to 3.8% of the class. The filing states this is based on 20,801,338 shares believed to be outstanding as disclosed in the document.

Does the Schedule 13G/A show who controls voting or disposition for MTRN shares?

Yes. The filing shows sole voting power and sole dispositive power over 789,873 shares. It lists zero shared voting or dispositive power for the reported position.

What entities comprise the reporting group named in the filing?

The filer is Capital Research Global Investors, a division of Capital Research and Management Company, together with listed investment management subsidiaries and affiliates that provide services under that name.

What form and amendment number reports this ownership for MTRN?

This ownership is reported on an amended Schedule 13G (Amendment No. 4). The cover data includes CUSIP 576690101 and the issuer name Materion Corp. as shown in the filing.

When was the amendment signed and who signed it?

The filing is signed by Jae Won Chung, Vice President and Senior Counsel II at Capital Research and Management Company, with the signature date shown as 05/11/2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 10:19 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

Materion Corp.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

576690101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 576690101

1

Names of Reporting Persons

Capital Research Global Investors

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 789,873.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 789,873.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

789,873.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.8 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Materion Corp.
(b)	Address of issuer's principal executive offices: 6070 Parkland Blvd., Mayfield Hts., OH 44124
Item 2.
(a)	Name of person filing: Capital Research Global Investors
(b)	Address or principal business office or, if none, residence: 333 South Hope Street, 55th Fl, Los Angeles, CA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 576690101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 789,873 ** **Capital Research Global Investors ("CRGI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CRGI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital Research Global Investors." CRGI is deemed to be the beneficial owner of 789,873 shares or 3.8% of the 20,801,338 shares believed to be outstanding.
(b)	Percent of class: 3.8 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 789,873
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 789,873
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Capital Research Global Investors

Signature:	Jae Won Chung
Name/Title:	Vice President and Senior Counsel II, Capital Research and Management Company
Date:	05/11/2026